Superionic Phase Transition in Rb_{4}LiH_{3}(SeO_{4})_{4} Single Crystals

• Authors: M. Połomska , B. Hilczer , J. Wolak , A. Pietraszko
• Languages of publication: EN

Abstracts

EN

Derivatographic, dielectric and complex impedance studies of Rb_{4}LiH_{3}(SeO_{4})_{4} crystals revealed a superionic phase transition at T_{s} ≈ 448 K. The bulk conductivity rises from 10^{-6} to 10^{-4} (Ωm)^{-1} at T_{s}, and the activation energy of conductivity in the direction of crystal axes a and b (where a = b for tetragonal symmetry) W_{a} = W_{b} decreases from 0.94 eV in the low temperature phase to the value of 0.27 eV at T > T_{s}. The analysis of the results of X-ray studies at room temperature and at 450 K indicates that the fast ion transport, characterized by low activation energy, is related to the delocalization of the H2 protons in the O(12)-H2-O(24) bonds linking the Se(1)O_{4} and Se(2)O_{4} tetrahedra. The "cogwheel" mechanism is suggested to be involved in the fast proton transport.

Keywords

EN

61.50.Em; 62.20.Dc; 77.22.Gm

Discipline

• 77.22.Gm: Dielectric loss and relaxation

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1994
• Volume: 85
• Issue: 5
• Pages: 825-833

Dates

published

1994-05

received

1993-11-30

(unknown)

1994-03-01

Contributors

author

M. Połomska

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17/19, 60-179 Poznań, Poland

author

B. Hilczer

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17/19, 60-179 Poznań, Poland

author

J. Wolak

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17/19, 60-179 Poznań, Poland

author

A. Pietraszko

• Institute of Low Temperature Physics and Structural Research, Polish Academy of Sciences, Okólna 1, 50-950 Wrocław, Poland

Identifiers

DOI

10.12693/APhysPolA.85.825